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Protesters take part in a march during the second anniversary of the resignation of Hosni Mubarak, at Tahrir Square in Cairo, February 11, 2013.

Egyptian artist Mohammed Darwish with a puppet of President Mohamed Morsi during an anti-Muslim Brotherhood protest on Qasr El-Nile Bridge in Cairo, February 10, 2013.

A protester displays used shotgun shells he said were used in recent clashes in Tahrir Square, during events to mark the second anniversary of former President Hosni Mubarak's resignation, February 11, 2013.

Protesters shout slogans in a march during the second anniversary of the resignation of Hosni Mubarak, at Tahrir Square in Cairo, February 11, 2013.

Protesters take part in a march during the second anniversary of the resignation of Hosni Mubarak, at Tahrir Square in Cairo, February 11, 2013.